Monday 21 October 2013

Yerasov Gamma DS-1 Distortion


Old Yerasov Gamma series distortion. Box totally looks like a Boss rip off, but the insides are not.


11 comments:

  1. Cool...

    Two leds for clipping? Me likey.

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  2. Here's a video:

    http://youtu.be/TbGItnt6PhI

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  3. it´s still unverified, but sounds great

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  4. Replies
    1. 3mm on the schematic, but use what you want.
      +m

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  5. Tag it, IT MONSTEROUS!!!! I mean effin brutz I used 500k with 499k across it to get ~250k, and flat red LEDS, I'm shocked at how mgood it is.
    Thanks Miro

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  6. did this build but i am getting a "piiiiiii" sound when on the board.
    ic i am getting

    1 5.18
    2 5.20
    3 3.50
    4 10.12
    5 3.51
    6 4.31
    7 5.25
    8 0.24

    Any tips? can post pictures

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    Replies
    1. There's something very wrong with those voltages. Did you use the following pin arrangement?

      1 --- 8
      2 --- 7
      3 --- 6
      4 --- 5

      If so, with most of these IC based opamp circuits I would expect the pin voltages to be similar to the following:

      1 - 4.5v
      2 - 4.5v
      3 - 4.5v
      4 - 0v
      5 - 4.5v
      6 - 4.5v
      7 - 4.5v
      8 - 9v

      The fact that you haven't got 0V on pin 4 suggests that you haven't connected the ground connection up properly. Did you do the double link at the blue circle?

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  7. my power supply is givin 10.50v and not 9v (will change)

    The arrengement was right but on the reverse (i was using the wrong probe)

    So now

    1 - 5.10
    2 - 5.10
    3 - 3.43 (and the leds blink one each time)
    4 - 0
    5 - 3.43/3.44 (and the leds blink too quen taking mejur)
    6 - 4.41
    7 - 5.10
    8 - 10.20

    the d1 I am using 5819

    I do think my 3pdt (cheap brand) is suspecius now.

    Tks for the help will update with any finds on my mistakes.

    I am getting the "piiii" with a jrc4558 using the tl072 no sound comes.

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  8. guess sometimes all you need in time. After my last post, didnt advance much. today was talking about ds1 and got this pedal back on the table. I was one component short. Although i did review it many times back in November I just could not see it. .. learn my lesson here. BTW great sound. Tks Miro and IvIark, also congrats on the family .

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